JPH04117412A - Method for producing polyα-olefin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for producing polyα-olefins.

Prior Art When producing polyα-olefin using a catalyst component containing magnesium, titanium, chlorine and an electron-donating compound, it has a 5i-0-C bond together with an organoaluminum compound, or the general formula % formula % organic It is known that the use of silicon compounds improves the stereoregularity of the resulting polymer (for example,
No. 4-94690, No. 56-36203, No. 57-6
No. 3310, No. 58-83016, No. 62-1170
5 etc.).

Polymers obtained using the organosilicon compounds described in the above-mentioned publications generally have a narrow molecular weight distribution.

Problems to be Solved by the Invention By widening the molecular weight distribution of a polymer, the rigidity, fluidity, processability, etc. of the polymer can be improved.

As a method for widening the molecular weight distribution of a polymer, a method using a plurality of polymerization vessels having different polymerization conditions, so-called multistage polymerization, is generally performed.

However, when a multi-stage polymerization method is adopted, the process becomes complicated, the cost of the polymer increases, and the polymerization activity of the polymerization catalyst decreases.

An object of the present invention is to provide a method capable of producing poly-α-olefin with a wide molecular weight distribution in high yield in two steps.

Means for Solving the Problems As a result of extensive research, the present inventors discovered that the object of the present invention can be achieved by using a polymerization catalyst that uses two specific organosilicon compounds in combination. invention has been achieved.

That is, the present invention provides (A) a solid catalyst component containing a metal oxide, magnesium, titanium, halogen, and an electron-donating compound as essential components, (B) an organometallic compound, and (C) a general formula [where R1 is carbon Several 1 to 10 hydrocarbon groups, OR3
, SIR'3 or 03IR53, R' has 1 or more carbon atoms
10 hydrocarbon groups or 5iR63, R3,
R4, R5 and R6 each represent a hydrocarbon group having 1 to 10 carbon atoms. ] A dimethoxysilane compound of the general formula (D) [wherein R7 is a hydrocarbon group having 2 to 10 carbon atoms or SiR]. R8 is a hydrocarbon group having 1 to 10 carbon atoms, or 5IR123, R11 and RIG are the same or different hydrocarbon groups having 1 to 10 carbon atoms, and R11 and R12
represents a hydrocarbon group having 1 to 10 carbon atoms. ] A method for producing a poly-α-olefin comprising polymerizing an α-olefin in the presence of a polymerization catalyst comprising an alkoxysilane compound.

The solid catalyst component (hereinafter referred to as "component"), which is one component of the polymerization catalyst used in the present invention, has metal oxides, magnesium, titanium, halogen, and electron-donating compounds as essential components. Usually, it is prepared by contacting a metal oxide, a magnesium compound, a titanium compound, an electron-donating compound, and, if each of the above-mentioned compounds does not have a halogen, a halogen-containing compound.

(1) Metal oxide The metal oxide used in the present invention is an oxide of an element selected from the group of elements of Groups 1 to 2 of the Periodic Table of Elements,
To illustrate them, B, 03, MgO1A1203
S+02, Can TiO2, ZnO1ZrL
, SnL, Ban Th0z, etc. Among these, B2O3, MgO1A1203.5102,
TiO2 and ZrO2 are preferable, and 5IO2 is particularly preferable. Furthermore, composite oxides containing these metal oxides, such as 5L02 MgO1Sin, -^1203.5102
TlO2,5i02-V2Ds 5iO2-Cr2
0s, 5102-T102 Mg ports, etc. may also be used.

These metal oxides are usually in the form of powder. The size and shape of the powder often affect the shape of the obtained olefin polymer, so it is desirable to adjust it appropriately. For the purpose of removing poisonous substances before use, it is desirable to sinter metal oxides at as high a temperature as possible, and to handle them in a manner that prevents them from coming into direct contact with the atmosphere.

(2) Magnesium Compound A magnesium compound is represented by the general formula MgR'R'. In the formula, R1 and R2 represent the same or different hydrocarbon group, OR group (R is a hydrocarbon group), or a halogen atom.

More specifically, as the hydrocarbon group for R1 and R2, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group, or an aralkyl group, and as an OR group, R has 1 to 12 carbon atoms. The alkyl group, cycloalkyl group, aryl group, and aralkyl group are halogen atoms such as chlorine,
These include bromine, iodine, and fluorine.

Specific examples of these compounds are shown below, and in the chemical formula, Me: methyl, Et: ethyl, Pr: propyl, Bu
Nibutyl, He: hexyl, Oct: octyl, Ph
: Represents phenyl and cyHe dichlorohexyl, respectively.

MgMe2. MgEtz, Mg1-Pr2. M
gBu2. MgHe2゜Mg0ctz, MgBt
Bu, MgPh2. MgcyHe2Mg('OM
e) s, Mg(OBt)2, Mg(OBt)
u)z, Mg (mouth He) 2Mg (00ct)2
, Mg(mouthPh)2, Mg(mouthcyHe)2
.

BtMgCl, BuMgCl, HeMgCl,
i-BuMgCl, tBuMgCl, PhMg
[:1, PhCHJgCl, BtMgBr.

BuMgBr, PhMgBr, BuM
gl, EtMgCl.

Bu MgCl, He0MgCl, Ph0Mg
Cl, EtOMgBr.

BuOMgBr, BtOMgl, MgCL,
MgBr2. MgL.

The above magnesium compound can also be prepared from metallic magnesium or other magnesium compounds when preparing component A.

Examples include metallic magnesium, halogenated hydrocarbons, and alkoxy group-containing compounds of the general formula Hydrogen group, M is boron, carbon, aluminum, silicon or phosphorus atom, R is carbon number 1-20
m represents the valence of M, m>n≧0.

] is mentioned. The hydrocarbon groups of X and R in the general formula of the alkoxy group-containing compound include methyl (Me), ethyl (Bt), propyl (Pr),
i-Propyl (1-Pr) Butyl (Bu) 1-Butyl (1-Bu) Hexyl (He) Octyl (O
Alkyl groups such as ct), cyclohexyl (cyHe)
Cycloalkyl groups such as methylcyclohexyl, alkenyl groups such as allyl, propenyl, butenyl, phenyl (
Ph)) IJ, aryl groups such as xylyl groups, and aralkyl groups such as phenethyl and 3-phenylpropyl.

Among these, alkyl groups having 1 to 10 carbon atoms are particularly desirable. Specific examples of alkoxy group-containing compounds are listed below.

C (Me>4. [:
(OBt)a.

C(OPr), , C(OBu), , C
(mouth1-BLI)4, [:(OHe)4.

C(00ct)+' HC(OMe) contained in formula XC(OR) 3HC(OBt), , H
C(OPr)3, HC(Bu)3, H
C(01-1e)3HC(OPh)3; MeC(
OMe)3, MeC(mouthBt)3, Br
C(OMe):+.

BtC(OBt)3. cyHeC(OEt)+
, PhC(OMe)+.

PhC(OBt)a, CH, CIC(OBt)3
．． MeCHBrC(OBt)+.

MeCHCIC(OBt)s; CIC(OMe
＞+ , CIC([]Et)3゜CIC(Oi-B
u)s, BrC(OEt)3; formula X, C(OR),
MeCH (OMe) contained in 2. MeCH(OBt
)s, CH2(OMe)z.

CH2 (OBt), , CHClCH (mouth E!t
L, CHCl2CH (mouth Bt)2CC1,CH
(OBt), , CH, BrCH(OBt)z,
PhCH(OBt), .

St (OMe) a contained in compound formula 5i (OR>4 when 0M is silicon)
, St (OBt) <.

Si(Bu)<, 5i(Di-Bu)4,
5i(OHe)<5i(00ct)< , 5i(O
Ph)4: H3t (
OBt)3. H3t(OBu)s, H3i(OH
e) 3H3i(OPh)+: MeSi(OMe)3
．． MeSi(OEt)+.

MeSi(OBu)a, BtSi(OBt)+,
Ph5i(OEt)+.

BtSi(OPh)+ ; CISCl5i(O+
, Cl5i(Bt)3.

Cl5i(OBu)s, Cl5i(OPh)+,
Br5i(OBt)a; Formula X2Sl (OR) 2
Me, Si (OMe)2゜Me2Si (OB
t)2, 1Et2si(OBt)2; MeC
ISi (mouth Bt) 2CHCI□5iH (mouth Et: h
; CCl35iH(OBt)2 ; MeBrSi(
OBt)z: X, Me3SiO contained in 5iOR
Me.

Me3SiOEt, Me+5iOBu, Me3
SiOPh, Bt3SiOBt.

Ph5StOBt 0 ■B (OBt) contained in the compound formula B (OR) when M is boron3. B([
1BLI)3.

B(OHe)s, B(OPh)3゜When 0M is aluminum, AI (OMIB>3
, AI(OBt)s.

AI(OPr)+, Al(Ol-Pr)3. A
I(OBLI)3.

Al(Ot-Bu)+, Al(Otle)s
, AI(mouthPh)s.

P(OMe) + , P(O
Bt)3゜P(OBu)3. P(OHe)3. P(
OPh)3° Furthermore, as the magnesium compound, a complex with an organic compound of a metal (M) of Group 1 or Group 1IIa of the periodic table can also be used. The complex has the general formula MgR'R
'·n(MR3,). Examples of the metal include aluminum, zinc, calcium, etc., and R3 is an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, an aryl group, or an aralkyl group.

Further, m represents the valence of the metal M, and n represents a number of 0, 1 to 10. Specific examples of compounds represented by MR' include A
IMe3. AIBts, 81i-Bu+,
AlPh3゜ZnMe2.2nBtz, 2nB
u2.2nPh2. Examples include CaEt2°CaPhz.

(3) Titanium compounds Titanium compounds are compounds of divalent, trivalent, and tetravalent titanium, and examples thereof include titanium tetrachloride, titanium tetrabromide, trichloroethoxytitanium, trichlorobutoxytitanium, and dichlorjetoxytitanium. , dichlordibutoxytitanium, dichlordiphenoxytitanium, chlortriethoxytitanium, chlortributoxytitanium, tetrabutoxytitanium, titanium trichloride, and the like. Among these, tetravalent titanium halides such as titanium tetrachloride, trichlorethoxytitanium, dichlorodibutoxytitanium, and dichlordiphenoxytitanium are preferred, and titanium tetrachloride is particularly preferred.

(4) Electron-donating compounds Examples of electron-donating compounds include carboxylic acids, carboxylic anhydrides, carboxylic esters, carboxylic acid halides, alcohols, ethers, ketones, amines,
Examples include amides, nitriles, aldehydes, alcoholates, phosphorus, arsenic and antimony compounds bonded to organic groups via carbon or oxygen, phosphoamides, thioethers, thioesters, carbonic esters and the like.

Among these, carboxylic acids, carboxylic anhydrides, carboxylic esters, carboxylic halides, alcohols, and ethers are preferably used.

Specific examples of carboxylic acids include aliphatic monocarboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, pivalic acid, acrylic acid, methacrylic acid, and crotonic acid, malonic acid, and succinic acid. , aliphatic dicarboxylic acids such as glutaric acid, adipic acid, sebacic acid, maleic acid, fumaric acid, aliphatic oxycarboxylic acids such as tartaric acid, cyclohexane monocarboxylic acid, cyclohexene monocarboxylic acid, cis-1,2-cyclohexanedicarboxylic acid ,
Alicyclic carboxylic acids such as cis-4-methylcyclohexene-1,2-dicarboxylic acid, aromatic monomers such as benzoic acid, toluic acid, anisic acid, p-tert-butylbenzoic acid, naphthoic acid, and cinnamic acid. Examples include aromatic polycarboxylic acids such as carboxylic acid, phthalic acid, isophthalic acid, terephthalic acid, naphthalic acid, trimellidic acid, hemimellitic acid, trimesic acid, pyromellitic acid, and mellitic acid.

As the carboxylic acid anhydride, acid anhydrides of the above-mentioned carboxylic acids can be used.

As the carboxylic acid ester, mono- or polyhydric esters of the above-mentioned carboxylic acids can be used, and specific examples include butyl formate, ethyl acetate, butyl acetate, isobutyl isobutyrate, propyl pivalate, isobutyl pivalate, and agril. Ethyl acid, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, diethyl malonate, diisobutyl malonate, diethyl succinate, dibutyl succinate, diisobutyl succinate, diethyl glutarate, dibutyl glutarate, diisobutyl glutarate,
Diisobutyl adipate, dibutyl sebacate, diisobutyl sebacate, diethyl maleate, dibutyl maleate, diisobutyl maleate, monomethyl fumarate, diethyl fumarate, diisobutyl fumarate, diethyl tartrate, dibutyl tartrate, diisobutyl tartrate, ethyl cyclohexanecarboxylate, Methyl benzoate, ethyl benzoate, methyl p-)rulyate, ethyl p-tert-butylbenzoate, p-ethyl anisate, ethyl α-naphthoate, isobutyl α-naphthoate, ethyl cinnamate,
Monomethyl phthalate, monobutyl phthalate, dibutyl phthalate, diisobutyl phthalate, dihexyl phthalate,
Dioctyl phthalate, di-2-ethylhexyl phthalate,
Disulfur phthalate, diphenyl phthalate, diethyl isophthalate, diisobutyl isophthalate, diethyl terephthalate, dibutyl terephthalate, diethyl naphthalate,
Dibutyl naphthalate, trimellitic acid
Examples include ethyl, triphyllate trimellitate, tetramethyl pyromellitate, tetraethyl pyromellitate, and tetrabutyl pyromellitate.

As the carboxylic acid halide, acid halides of the above-mentioned carboxylic acids can be used, and specific examples thereof include acetic acid chloride, acetic acid bromide, acetic acid iodide, propionic acid chloride, butyric acid chloride, butyric acid chloride, butyric acid bromide, acetic acid iodide, and pivaline. Acid chloride, pivalic acid bromide, acrylic acid chloride, acrylic acid bromide,
Acrylic acid iodide, methacrylic acid chloride, methacrylic acid iodide, methacrylic acid iodide, crotonic acid chloride, malonic acid chloride, malonic acid promide,
Succinic acid chloride, succinic acid bromide, glutaric acid chloride, glutaric acid bromide, adipic acid chloride, adipic acid bromide, sebacic acid chloride, sebacic acid chloride, maleic acid chloride, maleic acid chloride, fumaric acid chloride, fumaric acid bromide, tartaric acid chloride , tartaric acid bromide, cyclohexanecarboxylic acid chloride, cyclohexanecarboxylic acid chloride, 1-cyclohexenecarboxylic acid chloride, cis-4-methylcyclohexenecarboxylic acid chloride, cis-4-methylcyclohexenecarboxylic acid chloride, benzoyl chloride, benzoyl bromide, p- toluic acid chloride, p-) toluic acid bromide,
p-Anisyl chloride, p-anisyl bromide, α-naphthoic acid chloride, cinnamic acid chloride, cinnamic acid bromide, phthalic acid dichloride, phthalic acid dibromide, isophthalic acid dichloride, isophthalic acid dibromide, terephthalic acid dichloride, naphthalic acid Dichloride is mentioned.

Monoalkyl halides of dicarboxylic acids such as monomethyl adipate chloride, monoethyl maleate chloride, monomethyl maleate, and butyl phthalate chloride may also be used.

Alcohols are represented by the general formula ROH.

In the formula, R is alkyl, alkenyl, cycloalkyl, aryl, or aralkyl having 1 to 12 carbon atoms.

Specific examples include methanol, ethanol, propatool, isoproptool, butanol, isobutanol, pentanol, hexanol, octatool, 2-
These include ethylhexanol, cyclohexanol, benzyl alcohol, allyl alcohol, phenol, cresol, xylenol, ethylphenol, isopropylphenol, p-tert-butylphenol, n-octylphenol, and the like. Ethers have the general formula RDR
' In the formula, R and R' have 1 to 12 carbon atoms.
alkyl, alkenyl, cycloalkyl, aryl, and aralkyl, and R and R1 may be the same or different. Specific examples include diethyl ether, diisopropyl ether, dibutyl ether, diisobutyl ether, diisoamyl ether, di-2-ethylhexyl ether, diallyl ether, ethyl allyl ether, butyl allyl ether, diphenyl ether, anisole, ethylphenyl ether, and the like.

The method for preparing component A is as follows: ■Metal oxide (component 1), magnesium compound (component 2), titanium compound (component 3)
and an electron-donating compound (component 4) in that order. ■After bringing component 1 and component into contact, component 4 and component 3
in that order. ■Ingredients 1. After contacting component 2, component 3 and component 4 are brought into contact simultaneously; ■After contacting component 2 and component 3, component 4 and component 1 are brought into contact in that order;■Component 2 and component 4. Component 3 and Component 1 are brought into contact in that order after contacting Component 2. A method such as bringing component 3 and component 4 into contact at the same time and then contacting component 1 may be adopted. It is also possible to contact with a halogen-containing compound before contacting with component 3.

Examples of halogen-containing compounds include halogenated hydrocarbons, halogen-containing alcohols, halogenated silicon compounds having a hydrogen-silicon bond, halides of elements of group Na, group IVa, and group Va of the periodic table (hereinafter referred to as metal halides), etc. can be mentioned.

Examples of halogenated hydrocarbons include mono- and polyhalogen-substituted saturated or unsaturated aliphatic, alicyclic and aromatic hydrocarbons having 1 to 12 carbon atoms. Specific examples of these compounds include, for aliphatic compounds, methyl chloride, methyl bromide, methyl iodide, methylene chloride, methylene bromide, methylene iodide, chloroform, bromoform, iodoform, carbon tetrachloride, carbon tetrabromide, carbon, ethyl chloride, ethyl bromide, ethyl iodide, 1,2-dichloroethane, 1,2-dibromoethane, 1,2-short ethane,
Methyl chloroform, methyl bromoform, methyl iodoform, 1.1.2-trichloroethylene, 1.1.
2-) Libromoethylene, 1,1,2゜2-tetrachloroethylene, pentachloroethane, hexachloroethane, hexabromoethane, n-propyl chloride, 1,
2-dichloropropane, hexachloropropylene, octachloropropane, decabromobutane, chlorinated paraffin, alicyclic compounds such as chlorocyclopropane, tetrachlorocyclopenkune, hexachlorocyclopentadiene, hexachlorocyclohexane, aromatic compounds Examples include chlorobenzene, bromobenzene, -dichlorobenzene, p-dichlorobenzene, hexachlorobenzene, hexabromobenzene, pencitrichloride, p-chloropencitrichloride, and the like. Not only one kind but also two or more kinds of these compounds may be used.

A halogen-containing alcohol refers to a compound in which one or more hydrogen atoms other than the hydroxyl group in a mono- or polyhydric alcohol having one or more hydroxyl groups in the molecule are substituted with a halogen atom. do. Examples of the halogen atom include chlorine, bromine, iodine, and fluorine atoms, with chlorine atoms being preferred.

Examples of these compounds include 2-chloroethanol, 1
-chlor-2-propatol, 3-chlor-1-propatol, 1-chloro-2-methyl-2-propatol,
4-chloro-1-butanol, 5-chloro-1-pentanol, 6-chloro-1-hexanol, 3-chloro-
1,2-7'ropanediol, 2-chlorocyclohexanol, 4-chlorobenzhydrol, (m, o,
p)-Chlorobenzyl alcohol, 4-chlorocatechol, 4-chloro-(m,o)-cresol, 6-chloro-(m,o)-cresol, 4-chloro-3,5-dimethylphenol, chlorhydroquinone, 2-benzyl-4-chlorophenol, 4-chloro-1-naphthol, (m,o,p)-chlorophenol, p-chloro-α
-Methylbenzyl alcohol, 2-chloro-4-phenylphenol, 6-chlorthymol, 4-chlorresorcin, 2-bromoethanol, 3-bromo-1-propanol, 1-bromo-2-propanol, 1-bromo- 2
Butanol, 2-bromo-p-cresol, 1-bromo-
2-naphthol, 6-bromo-2naphthol, (m, o
, p)-bromophenol, 4-bromoresorcin, (
m, o, p) Fluorophenol, p-iodophenol: 2゜2-dichloroethanol, 2,3-dichloro-1
-propertool, 1,3-dichloro-2-propertool, 3-chloro-1-(α-chloromethyl)-1-propertool, 2,3-dibromo-1-propertool, 1.3
-dibromo-2-propatol, 2,4-dibromophenol, 2,4-dibromo-1-naphthol: 2,22
-Trichlorethanol, 1.1.1-) Lichloroethanol 2
-Proper tool, β, β, β-trichlororoutert-
Butanol, 2,3.4-)dichlorophenol, 2.
4.5-) dichlorophenol, 2,4.6-) dichlorophenol, 2.4.6-) ribromphenol, 2
,3°5-t! J bromo-2-hydroxytoluene, 2
゜3.5-)ribromo-4-hydroxytoluene, 2.
2.2-) Refluoroethanol, α, α.

α-Trifluoro-m-cresol, 2,4゜6-triiodophenol: 2,3,4.6tetrachlorophenol, tetrachlorohydroquinone, tetrachlorbisphenol A, tetrabromobisphenol A, 2,2
, 3.3-tetrafluoro-1-propertool, 2,3
Examples include 5.6-tetrafluorophenol and tetrafluororesorcin.

Examples of silicon halide compounds having a hydrogen-silicon bond include H3IC13, H2SiCl2, LSiC]HC
LSiC12, HC2LSi[l:12. H(t-C
J,) SiC1z.

HCsHsStC1□, H(CH3)2SICI,
H(]-C3H7)2SICILCJsSiCI
L(n-C4Hs)SiC1,L(CeH,CL)Si
Examples include C1, H3iC1(Cr, Hs)2, and the like.

Examples of metal halides include B, AI, Ga, and In.

Tl, Si, Ge, Sn, Pb, As, S
b. Bi chloride, fluoride, bromide, iodide, especially BCl3. BBr3. B13. AI mouth 13, A]Br+.

GaCl3. GaBr, , InCl3. TlC
1,,5iC1<.

5nC14, 5bC1s, 5bPs, etc. are suitable.

Ingredient 1. F&min 2. Contact with component 3 and component 4, and a halogen-containing compound that can be brought into contact as necessary, is carried out by mixing and stirring in the presence or absence of an inert medium, but by mechanical co-pulverization. Ru. Contact is 4
It can be carried out under heating at 0 to 150°C.

As the inert medium, saturated aliphatic hydrocarbons such as hexane, heptane and octane, saturated alicyclic hydrocarbons such as cyclopentane and cyclohexane, aromatic hydrocarbons such as benzene, toluene and xylene can be used. .

Specific examples of the method for preparing component A in Honhathu include JP-A-58-162.607, JP-A-5594909, and JP-A-5.
No. 5-115405, No. 57-108107, No. 61
-21109, 61-174204, 61-1
No. 74205, No. 61-174206, No. 62-77
Examples include the method disclosed in Japanese Patent No. 06 and the like. More specifically, ■ A method in which a reaction product of a metal oxide and a magnesium dialkoxide is brought into contact with an electron-donating compound and a tetravalent titanium halide (JP-A-58-162607). A method of contacting a reaction product with a magnesium hydrocarbyl halide compound with a Lewis base compound and titanium tetrachloride (JP-A-55-94909) ■ A reaction product between a porous carrier such as silica and an alkylmagnesium compound, Method of contacting with an electron-donating compound and a silicon halide compound before contacting with a titanium compound (JP-A-55115405, JP-A No. 57-10810)
7) ■ A method of bringing a metal oxide, an alkoxy group-containing magnesium compound, an aromatic polycarboxylic acid having a carboxyl group at the ortho position or a derivative thereof, and a titanium compound into contact (Japanese Unexamined Patent Publication No. 174204/1983) ■ Metal oxide, alkoxy-containing magnesium compound,
A method of bringing a silicon compound having a hydrogen-silicon bond, an electron-donating compound, and a titanium compound into contact (Unexamined Japanese Patent Publication No. 61-17
4205 Publication) ■ Method of bringing metal oxide, alkoxy-containing magnesium compound, halogen element or halogen-containing compound, electron donating compound, and titanium compound into contact (JP-A-61-174206 Publication) ■ Metal oxide, dihydrocarbyl magnesium A method of contacting a reaction product obtained by contacting a halogen-containing alcohol with an electron-donating compound and a titanium compound (JP-A-61-21109) ■ Metal oxide, hydrocarbylmagnesium, and hydrocarbyloxy group-containing compound (corresponding to the alkoxy group-containing compound) is brought into contact with a halogen-containing alcohol, and further brought into contact with an electron-donating compound and a titanium compound (JP-A No. 6
2-7706). Among these methods, methods ① to ① are particularly desirable, and methods ① and ② are particularly preferable.

Component A is prepared as described above, and if necessary, component A may be washed with the above-mentioned inert medium and may be further dried.

In addition, component A further comprises, in the presence of an organoaluminum compound,
Olefin polymers formed in component A upon contact with olefins may also be included. The organoaluminum compound is selected from the organometallic compounds described below that are one of the components of the catalyst of the present invention.

Examples of olefins include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, etc.
-Olefins may be used.

Contact with the olefin is preferably carried out in the presence of the inert medium described above. The contact is usually carried out at a temperature of 100°C or less, preferably -10°C to +50°C. The amount of olefin polymer contained in component A is usually 0 per gram of component A.
．． It is 1-100g.

In the contact between component A and the olefin, an electron-donating compound may be present together with the organoaluminum compound. The electron-donating compound is selected from among the compounds used in preparing component A. Component A that has been in contact with the olefin can be washed with the above-mentioned inert medium, if necessary, or further dried.

Organometallic compoundsOrganometallic compounds (hereinafter referred to as component B) are listed in No.■ of the periodic table.
It is an organic compound of a group metal to a group II metal. As component B, organic compounds of lithium, magnesium, calcium, zinc and aluminum can be used. Among these, organoaluminum compounds are particularly suitable. As the organoaluminum compound that can be used, general formula R,,^lX
3-. ．． (However, R is an alkyl group or an aryl group, X is a halogen atom, an alkoxy group, or a hydrogen atom, and n is an arbitrary number in the range of 1≦n≦3.) Alkyl aluminum, dialkyl aluminum monohalide, monoalkyl aluminum civalide, alkyl aluminum sesquihalide, dialkyl aluminum monoalkoxide, dialkyl aluminum monohydride, etc. with 1 to 1 carbon atoms
Particularly preferred are alkylaluminum compounds having 8, preferably 2 to 6 carbon atoms, or mixtures or complexes thereof. Specifically, trialkylaluminum such as trimethylaluminum, triethylaluminum, tripropylaluminum, triisobutylaluminum, trihexylaluminum, dimethylaluminum chloride, diethylaluminum chloride, diethylaluminum bromide, diethylaluminum iodide, diisobutylaluminum chloride, etc. dialkylaluminum monohalides, methylaluminum dichloride, ethylaluminum dichloride, methylaluminum dichloride, ethylaluminum dichloride, ethylaluminum diiodide, isobutylaluminum dichloride, monoalkylaluminum dihalides, alkylaluminum sesquihalides such as ethylaluminum sesquichloride, Dialkyl aluminum monoalkoxides such as dimethyl aluminum methoxide, diethylaluminum ethoxide, diethylaluminum phenoxide, dipropyl aluminum ethoxide, diisobutyl aluminum ethoxide, diisobutyl aluminum phenoxide, dimethyl aluminum hydride, diethyl aluminum hydride, dipropyl aluminum hydride, diisobutyl aluminum Examples include dialkyl aluminum hydride such as hydride. Among these, trialkylaluminum is preferred, particularly triethylaluminum and triisobutylaluminum. In addition, these trialkylaluminums may be combined with other organoaluminum compounds such as industrially easily available diethylaluminum chloride, ethylaluminum dichloride, ethylaluminum sesquichloride, diethylaluminum ethoxide, diethylaluminium hydride, or mixtures or complex compounds thereof. Can be used in combination with etc.

Furthermore, an organic aluminum compound in which two or more pieces of aluminum are bonded via an oxygen atom or a nitrogen atom can also be used. Such compounds include, for example (C2H3),
Al0AI(C2H5)2.

(C,L) 2A10^1 (C4H9)2 , (
Examples include C2H5)28INAl (C2H5)2t, L, and the like.

Examples of organic compounds of metals other than aluminum include diethylmagnesium, ethylmagnesium chloride, diethylzinc, etc., as well as LiA1 (CJs)4. LiA1(CJ+s)a
Compounds such as

Dimethoxysilane compound A dimethoxysilane compound (hereinafter referred to as component C) is one component of the polymerization catalyst used in the present invention.

is represented by the above general formula. In the formula, R1-R
The hydrocarbon group of 6 includes an alkyl group, an alkenyl group,
Examples include a cycloalkyl group, a cycloalkenyl group, a cycloalkagenyl group, an aryl group, and an aralkyl group.

Alkyl groups include methyl, ethyl, propyl, i-
Propyl, butyl, ]-butyl, S-butyl, t-butyl, amyl, i-amyl, t-amyl, hexyl, octyl, 2-ethylhexyl, decyl, etc., and alkenyl groups include vinyl, allyl, propenyl, 1-butenyl, 1-pentenyl, 1-hexenyl, 1-octenyl, 1-butenyl, 1-methyl-1-pentynyl, 1-methyl-1-hebutenyl, etc., cycloalkyl groups include cyclopentyl, cyclohexyl, Methylcyclohexyl group etc., cycloalkenyl group such as cyclopentenyl, cyclohexenyl, methylcyclohexenyl group, etc., cycloalkagenyl group such as cyclopentagenyl, methylcyclopentagenyl, indenyl group, etc. Examples of the aryl group include phenyl, tolyl, and xylyl groups, and examples of the aralkyl group include benzyl, phenethyl, and 3-phenylpropyl groups.

A specific example of component C is described below using a chemical formula. In the formula, Me: methyl, Bt: ethyl, Pr: propyl,
Bu Nibutyl, Pt: Pentyl, Hex: Hexyl, 0
ct=octyl, Dec: decyl (same for components) (Me>zsi(OMe)z, (BtLSi(O
Me)2. (n-Pr)zSi(OMe)sr
, (i-Pr)zsi(mouthMe)2,
(n-Bu)zsi (OMe)z, (i-BL
I) asi(OMe)sr, (s-Bu)2si
(OMe)a.

(t-Bu)zs+(OMe)z, (n-Pt)
2si(OMe)2. (nHex>zsi(OMe
)2. (Me)(Bt)Si(OMe)2. (
Me)(nPr)Si(OMe)z, (Me>(
n-Bu)Si(OMe)z, (Me)(t-B
u) Si(OMe)z, (Me)(n-HeX)
Si(QMe)2. (Bt)(i-Pr)Si(O
Me)s, (Bt)(n-Bu)Si(OM
e)2, (Bt)(tBu)Si(OMe)z
, (Bt)(n-HeX)Si(OMe)2,
(n-Pr)(i-Pr)Si(OMe)s,
(n-Pr)(t-Bu)Si(OMe)2. (
nPr)(n-Pt)Si(OMe)z, (n-
Bu)(t-Bu)Si(OMe)2゜(i-Bu)(
t-Bu)Si (mouthMe)2, (t-Bu)
(t-Pt)Si(OMe)2゜(t-Bu)(s
-Pt)Si(OMe)z, (t-Pt)2
si(mouthMe)2.

C] (t Pt)St([]Me)z, C(E
t)(Me)zc-CH2:]C2L]2Si
(OMe)2, (t-Hex)[(Bt)(Me
)2c・CH2:] ssi(OMe):
(MesSi)(Me)Si(mouthMe)=.

(MesSi) ([!t)Si (mouthMe)2,
(MesSi)(i-Pr)Si(OMe)z,
(MeaSi)(t-Bu)Si(OMeL,
(Me+Si)(n-Bu)Si(OMe)2,
(Me+Si)(s-Bu)Si(OMe)2.

(M+, 3S+) (cyclopentyl)Si(OMe)
2. (MesSi) (cyclopentagenyl)Si
(OMe) , (Me+Si)zSi(OMe)z
, (Bt*Si)(Me)Si(mouthMe)2
1 (Bt3S+) (Bt)Si(mouthMe)2
, (Bt+Si)(i-Pr)Si(OMe)2
.

(BtsSi)(t-Bu)Si(OMe)2,
(Et3Si)(n-Bu)Si(OMe)2. (
Bt3Si)(s-Bu)Si(OMe)z, (
Et+5i) (cyclopentyl)Si (OMe) 2
, (Et3Si) (cyclopentagenyl)
Si(mouthMe), (MesSi)2Si(mouthMe
>2(Me+SiO)(Me)Si(OMe)z,
(Me3SiO)(Bt)Si(OMe)2,
(Me+5iO)(i-Pr)Si(mouthMe)2
, (Me3SiO)(t-Bu)Si(OMe)
2. (EtsSiO) (Me)Si(OMe)2°(Bt3SiO)([!t)Si(OMe)2. (
Bt3SiO)(i-Pr)Si(DMe)z,
(BtaSiO)(t-Bu)Si(OMe)2;
(to) (iPr)Si(OMe)2. (
i-Pr[])(Me)Si(OMe)2. (i-
PrO)(n-Pr)Si(OMe)2, (n
-PrO)(t-Pt)Si(Me)2.

(i-Pro)(n-41ex)Si(OMe)2,
(n-Bun) (Me)Si(OMe)2
．． (t-BuO)(Me)Si(OMe)2.
(s-BuO)(Et)Si(OMe)z, (i
-BuO)(i-Pr)Si(OMe)z, (t-
BuO)(t-Bu)Si(OMe)z, (n-
BuO)(s-Bu)Si(OMe)2゜(t-BuO
)(n-Pt)Si(OMe)z, (n-P
tO)(i-Pr)Si(mouthMe)z, (t-P
tO)(t-Bu)Si(OMe)2. (t-Pt
O) (tPt)Si(OMe)z, (t-PtO
)(Me)Si([1Me)s, (n-PtO)
(Bt)Si(OMe)z, (n-Hex)(M
e) Si(OMe)2. (nHex)(Bt)Si
(OMe)z, (n-HexO)(i-Pr)S
i(OMe)z(n-HexD)(t-Bu)Si(O
Me)z, (n-HexO)(n-Hex)Si
(OMe)z, (n-HexO)(n-Oct)
Si([]Me)2. (nOctD)(Me)Si
(OMe)2 , (n-Oct[1)(n-Oc
t) Si(Me)2, (i-Pro) (cyclohexyl) Si(OMe)2゜(i-PrO)
(Cyclopentyl)Sl (Ale)2. (i-P
rO)(cyclopentagenyl)Sl(Me),
(n-Bun)(cyclohexyl)Si(OMe)2
．． (n-BuO)(cyclopentyl)Si(OMe
)2. (Rho B Starvation) (Cyclopentagenyl) Sl
(Me), (i-Bun) (cyclohexyl)Si(OMe)z, (i-BuO)(cyclopentyl)Si(OMe)2゜(i-Bun) (cyclopentagenyl)Si(OMe), ( tBud)
(Cyclohexyl)Si (OMe) 2 , (
t Bun) (cyclopentyl)Si(OMe)2.
(t-BuO)(cyclopentagenyl)Si(O
Me), (t-PtO)(cyclohexyl)Sl
(Me) 2 , (t-PtO) (cyclopentyl)Si(OMe) 2 , (t-PtO) (
Cyclopentadienyl)Si(OMe) Alkoxysilane Compound The ziroxysilane compound (hereinafter referred to as "component"), which is one component of the polymerization catalyst used in the present invention, is represented by the above general formula. In the cough formula, the hydrocarbon groups for R7-R12 include alkyl groups, alkenyl groups, cycloalkyl groups, cycloalkenyl groups, cycloalkagenyl groups,
了IJ-JL.

group, aralkyl group, etc.

Examples of alkyl groups include methyl (excluding R7), ethyl, propyl, i-propyl, butyl, i-butyl, S-butyl, t-butyl, amyl, i-amyl,
t-amyl, hexyl, octyl, 2-ethylhexyl, decyl groups, etc., and alkenyl groups include vinyl, allyl, propenyl, 1-butenyl, 1-pentenyl, 1-hexenyl, 1-octenyl, 1-dekenyl, 1-methyl -1-pentynyl, 1-methyl-1-hebutenyl, etc.
Examples of the cycloalkyl group include cyclopentyl, cyclohexyl, and methylcyclohexyl groups; examples of the cycloalkenyl group include cyclopentenyl, cyclohexenyl,
Methylcyclohexenyl group, etc., cycloalkagenyl group, cyclopentagenyl, methylcyclopentagenyl, indenyl group, etc., aryl group,
Examples of the aralkyl group include phenyl, tolyl, and xylyl groups, and examples of the aralkyl group include benzyl, phenethyl, and 3-phenylpropyl groups. The hydrocarbon groups R9 and RIO are preferably alkyl groups, particularly methyl and ethyl groups.

Specific examples of the ingredients are listed below.

(BtO)zsi(OMe)2. (n-Pro)2
si(OMe)2゜(i-PrO)2si(OMe)2
．． (t-BuOLSi(OMe)2゜(s-BuO
LSi(OMe)2. (n-BuO)2si(OM
e>2゜(i-BuO)S i (mouthMe)2,
(t-PtO)zsi (OMe)2,
(nPtO)2si(OMe)z, (n-Hex
O)zsi(OMe)2. (n-OctO)2si
(OMe)2, (n-DecO)zsi(mouthM
e)2, (n-Pro)2Si(OBt)2
, (i-PrOLSi(OBtL,
(t-BuOLSi(OBt)z, (s-B
uO)zst(OBt)2, (n BLIO
)2S](mouthBtL, (i-BuO)*5i(O
Bt)z, (t-PtO)2si(OBt)s(
n-PtO)zsi(OBt)z, (n-H
exO)2si(OBt)z, (nOctO
)+5i(OBt)z, (n-DecO)zsi
(OBt)2; (Btu) (i-Pro)Si(OMe
)z, (BtO)(n-BuO)Si(OMe)
2゜(BtO)(s-BuO)Si(OMe)z,
(OBt port>(n-PtO)Si(OMe)2(
i-PrO)(n-BuO)Si(OMe>a,
(n-PrO)(t-BuO)Si(mouthMe), ,
(t-Bu 0Hn-BuO)Si(mouthMe)
2, (s-BuO)(i-BuO)2si(
OMe)z, (t-PtO)(n-Pr port)
Si(mouthMe)2.

(n-PtO)(i-Pro)Si(DMe)2
, (n-BuO)(t-PtO)Si(OMe)2
, (s-BuO) (s-PtO)Si(OM
e)2, (i-BuO)(n-PtO)S i
(Me)2, (t-PtO)(n-PtO)Si(
OMe)z.

(t-PtO)(n-HexO)S i (mouthMe)2
, (MeO)(i-Pro)Si(OBt)z
, (MeO)(n-BuO)Si(mouthBt)
2, (i-PrO)(n-BuO)Si(O
Bt)z, (n-Pro)(t-BuO)S
i(mouthIEt)2, (t-BuO)(n-B
uO) Si (OBt) 2 , (s-BuO)
(i-BuO) Si (OBt) 2(t-PtO
)(n-PrO)Si(OEt)2, (n-P
tO)(i-Pro)Si(mouthBt)2, (n
-BuO)(t-PtO)Si(mouthEtL,
(s-BuO) (sPtO)S big mouth Bt'L,
(i-BuO)(n-PtO)Si(OEt)z(t
-PtO)(n-PtO)Si (OBt)2.
(t-PtO)(n-HexO)Si(OBt)z:
(BtO)Si(OMe)3, (i-PrO)
Si(OMe)3.

(n-BuO)Si(OMe)3. (s-BuO)
Si(OMe)3, (i-BuO)Si(OMe
) + , (t-BuO)Si(mouthMeL,
(t-PtO)Si(OMe)3. (n-P
tO)Si(OMe)s, (n-HexO)(OM
e)3, (nOctO)Si(OMe)3,
(n-DecO)Si(OMe)3, (Me[
])Si(mouthBt)s, (i-Pro)Si
(OBt)3, (n-BuO)Si(OEt)s
.

(s-BuO)Si(OBt)s, (i-B
uO) Si(0巳t)3, (t-Buo)
Si(OEtL, (t-PtO)Si(O[
Et)+ , (n-PtO)Si(OEt)3
．． (n-HexO)Si(OBt)s, (
n-DctO)Si(OBt)+, (n-D
ecO)(0[Et)3; Me3SiSi
(OMe)3.

BtaSiO3i(OMe)3, Me3SiO3i(
OEt)+, BtsSiO3i(OEt)3,
(Me+5iO)zsi(mouthMe)2, (Bt
a SiO)2si(OMe)2, (Bt+
S+0)3S1 (mouthBt)z, (Bt3S
iO:hSi(OBt)2; 5l(OBt:L
.

The polymerization catalyst used in the present invention consists of component A, component B, component C, and component B.
is 1 to 2.000 gmol, preferably 20 to 500 gmol per gram atom of titanium in component A, component C.
and component content is 0 for 81 moles of components in their total amount.
, 001 to 10 mol, preferably 0.01 to 1.0 mol. In addition, with respect to the total amount of component C and component C, component C is 10 to 90 mol%, preferably 20 to 80 mol%, and component C is 90 to 10 mol%, preferably 80 to 20 mol%. Each is used as follows.

In the present invention, α-olefin is polymerized in the presence of the above polymerization catalyst to produce polyα-olefin.

α-olefins include α-olefins having 3 to 10 carbon atoms, such as propylene, 1-butene, 4-methyl-
Examples include 1-pentene, 1-hexene, and 1-octene.

In addition to the homopolymerization of α-olefins, the present invention
-Olefin mutual and/or ethylene etc. having 2 to 1 carbon atoms
Random copolymerization or block copolymerization with 0 other monoolefins or diolefins having 3 to 10 carbon atoms is also possible.

The polymerization reaction may be performed in either a gas phase or a liquid phase. When polymerizing in a liquid phase, inert carbonization of normal butane, isobutane, normal pentane, isopentane, hexane, heptane, octane, cyclohexane, benzene, toluene, xylene, etc. It can be carried out in hydrogen and in liquid monomers. The polymerization temperature is usually in the range of -80°C to +150°C, preferably 40 to 120°C. The polymerization pressure may be, for example, 1 to 60 atmospheres. The molecular weight of the resulting polymer can also be controlled by the presence of hydrogen or other known molecular weight regulators. Further, the amount of other olefin to be copolymerized with the α-olefin in the copolymerization is usually selected within the range of 30% by weight, particularly from 0.3 to 15% by weight based on the α-olefin. The polymerization reaction in the present invention is carried out in a continuous or batchwise reaction, and the conditions may be those commonly used. Further, the copolymerization reaction may be carried out in one stage, or may be carried out in two or more stages.

Effects of the Invention According to the method of the present invention, it is possible to produce a polyα-olefin with a wide molecular weight distribution while maintaining catalytic polymerization activity, compared to the case where component C or each component is used alone.

EXAMPLES The present invention will be specifically explained by examples and application examples. Note that percentages (%) in the examples are based on weight unless otherwise specified.

The molecular weight distribution of a polymer is determined by the ratio of weight average molecular weight to weight average molecular weight.
The number average molecular weight is a value measured by GPC.

Example 1 Preparation of Component A A 200 mf flask equipped with a dropping funnel and a stirrer was purged with nitrogen gas. In this flask, add silicon oxide (
5 g of C.952 (manufactured by DAVISON, trade name) calcined in a nitrogen stream at 200° C. for 2 hours and then at 700° C. for 5 hours and 40 ml of n-hebutane were added. Furthermore, 20 ml of a 20% n-hebutane solution of n-butylethylmagnesium (hereinafter referred to as BBM) (trade name: MAGALA BBM, manufactured by Texas Alkyls)! was added and stirred at 90°C for 1 hour.

After the suspension was cooled to 0° C., a solution of 11.2 g of tetraethoxysilane dissolved in 20-h of n-hebutane was added dropwise from the dropping funnel over 30 minutes. After the dropwise addition was completed, the temperature was raised to 50°C over 2 hours, and stirring was continued at 50°C for 1 hour. After the reaction was completed, the supernatant liquid was removed by decantation, the produced solid was washed with 60 ml of n-hebutane at room temperature, and the supernatant liquid was further removed by decantation. This washing treatment with n-hebutane was further repeated four times.

To the above solid, 50 ml of n-hebutane was added to make a suspension, and to this was added 8.0 ml of 2.2.2-trichloroethanol.
g to 10mf! A solution dissolved in n-heptane was added dropwise from the dropping funnel at 25° C. over 15 minutes. After the dropwise addition was completed, stirring was continued for 30 minutes at 25°C. After the reaction is complete,
At room temperature, twice with 60 m of n-hebutane.
Washing was performed three times with 1 toluene. When the obtained solid (solid component I) was analyzed, it was found to be 510236.
6%, magnesium 5.1%, and chlorine 38.5%.

To the solid component I obtained above, 10-heptane and 40-40% titanium tetrachloride were added, the temperature was raised to 90°C, and 0.6 g of di-n-butyl phthalate was dissolved in 5 ml of n-hebutane.
was added over 5 minutes.

Thereafter, the temperature was raised to 115° C., and the mixture was reacted for 2 hours.

After the temperature was lowered to 90° C., the supernatant liquid was removed by decantation, and the mixture was washed twice with 70 ml of n-hebutane. Further, 15 ml of n-hebutane and 40 ml of titanium tetrachloride were added, and the mixture was reacted at 115° C. for 2 hours. After the reaction is completed, the obtained solid substance is heated to 60mf! .

Washing was performed 8 times with n-hexane at room temperature.

Next, drying was performed at room temperature under reduced pressure for 1 hour to obtain 8.3 g of catalyst component (component A). This component A contains 3.1%
of titanium, as well as silicon oxide, chlorine and di-n-butyl phthalate.

Component A'12 obtained above was placed in a 1.5β stainless steel autoclave equipped with a propylene polymerization stirrer under a nitrogen gas atmosphere.
．． 1 mgSn-A solution containing 0.8 mol of triethylaluminum (hereinafter referred to as TBAL) in hebutane 1β 4-1 A solution containing 0.04 mol of t-butylmethyldimethoxysilane in n-hebutane 1β 1- and 1 ml of a solution containing 0.04 mol of triethylsilyloxytrimethoxysilane in 1β of n-hebutane was mixed and held for 5 minutes. Next, after 600 mff of hydrogen gas as a molecular weight control agent and 11 liquid propylene were injected under pressure, the temperature of the reaction system was raised to 70° C., and propylene was polymerized for 1 hour. After the polymerization was completed, unreacted propylene was purged to obtain white polypropylene powder. The polymerization activity of the catalyst was 10.8 kg/g/component A. Moreover, ~/Mn of the obtained polypropylene was 8.6.

Examples 2 to 6 Polymerization of propylene was carried out in the same manner as in Example 1, except that component C and components shown in Table 1 were used in the proportions shown in Table 1, and the results are shown in Table 1. Indicated.

Comparative Examples 1 to 6 Propylene polymerization was carried out in the same manner as in Example 1, except that component C and component R were not used. The results are shown in Table 1.

Example 7 Preparation of component A Silicon oxide and BEM were brought into contact with each other in the same manner as in Example 1, except that the stirring time at 90°C was changed to 2 hours, and then the supernatant liquid was removed by decantation, and the resulting solid was The solution was washed with 50-helbutane at room temperature, and the supernatant was removed by decantation. This washing treatment with n-hebutane was repeated four more times.

Add 20 ml of n-hebutane to the above solid to form a suspension, and add 2.2.2-) IJ chloroethanol9.
A solution of 6 g dissolved in 10 ml of n-hebutane was added dropwise from the dropping funnel at 0° C. over 30 minutes. 0℃
After continuing stirring for 1 hour, the temperature was raised to 80°C over 1 hour, and stirring was continued at 80°C for 1 hour. After the reaction is completed, at room temperature, 50ml! The solids (solid component
) was obtained.

To the solid component (1) obtained above, 20-toluene and 0.6 g of di-n-butyl phthalate were added, and the reaction was carried out at 50°C for 2 hours. Next, 30rn1 of titanium tetrachloride was added, and 9
After reacting for 2 hours at 0°C, the resulting solid material was
Washing was performed 8 times at room temperature with m1 of n-hexane. Dry for 1 hour at room temperature under reduced pressure to obtain 7.7 g of component A.
I got it.

Polymerization of propylene The procedure was the same as in Example 1, except that component A obtained above, component C1 shown in Table 2, and triisobutylaluminum were used instead of TEAL, and the polymerization temperature was 80°C. Polymerization of propylene was carried out and the results are shown in Table 2.

Example 8 Polymerization of propylene was carried out in the same manner as in Example 7, except that the compounds shown in Table 2 were used as component C and the components.
The results are shown in Table 12.

Comparative Example 7.8 Propylene was polymerized in the same manner as in Example 7 except that Component C or Component C was not used. The results are shown in Table 2.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the steps for preparing a polymerization catalyst used in the present invention.

Claims (1)

[Scope of Claims] (A) A solid catalyst component containing a metal oxide, magnesium, titanium, halogen, and an electron-donating compound as essential components, (B) An organometallic compound, and (C) General formula ▲ Numerical formula, chemical formula, table etc. ▼ [However, R^1 is a hydrocarbon group with 1 to 10 carbon atoms, OR
^3, SiR^4_3 or OSiR^5_3, R^
2 is a hydrocarbon group having 1 to 10 carbon atoms or SiR^6
_3, and R^3, R^4, R^5 and R^6 each represent a hydrocarbon group having 1 to 10 carbon atoms. ] Dimethoxysilane compound and (D) general formula ▲ Numerical formula, chemical formula, table, etc. ▼ [However, R^7 is a hydrocarbon group with 2 to 10 carbon atoms or SiR^1^1_3, R^8 is carbon Several 1 to 10 hydrocarbon groups or SiR^1^2_3, R^^9 and R
^1^0 represents the same or different hydrocarbon group having 1 to 10 carbon atoms, and R^1^1 and R^1^2 represent a hydrocarbon group having 1 to 10 carbon atoms. ] A method for producing a polyα-olefin, which comprises polymerizing an α-olefin in the presence of a polymerization catalyst comprising an alkoxysilane compound.